And I'm not talking about the renown rank cap increase.
You won't be able to just zerg it up in Open RvR and expect to win quickly. You won't be able to jump in your elite premade and just roll the uncoordinated in scenarios all day long. You won't be able to complain that you got rolled by an elite premade when you just entered Tier 4.
1.4.0 is officially called "The Verminous Horde." I call it "The Excuse Buster."
A lot of the excuses players make about why they lose in scenarios suddenly disappear when you put players of equal skill/gear/organization together. No, the only reason you lose when you are against opponents roughly equal to you is you got outplayed.
For Open RvR, every once in awhile, the RR65+ disappear into the Skaven dungeon leaving the lower ranked players to duke it out up above. You might get outnumbered. So what? Just means you get to milk the sweet, sweet, Against All Odds buff for extra renown. Heck, you might even win if you outplay your opponents. So what if you end up losing the campaign? You get a chance at the new gear by defending your city. Since the city is considered a scenario, you end up with players similar in skill to you there too (unconfirmed and pure speculation, but would be awesome.)
WAR is going to be better than ever I think. So what's your excuse for not playing?